Shutter shock is simply a vibration caused by the movement of the mechanical shutter. It causes blurred photos at slow shutter speeds. The anti-shock (diamond) mode 0s does not have side effects. Do exactly what pdk42 said:
"1) Set shutter to "0s anti-shock" (diamond symbol) and enable release-time lag = short (bottom of cogs menu C I think). This will 100% guarantee no potential for shutter shock."

[I don't happen to agree with his other suggestion "2) Turn "keep warm colors" to off (cogs menu G). This will stop interior shots in artificial light looking too orange."
The reason - I like interior shots to look a bit yellow, that is what we actually see in our houses at night. It is a matter of individual preference.]